We start with the treatment against calcification by proposing and installing watersofteners. Watersofteners reduce very much the use of chemical products (house cleaning, soaps, anti-calc, ...) and help a lot to save energy. The installation of drinkable water systems in offices, horeca, schools, etc, but also at home, is an important step to stop the abuse of plastics. Recuperating rainwater is the following step to reduce the spoiling of drinkable water. We try to give an all-round advice and to propose a correct solution.